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Investment in Securities - Summary of Fair Value, Amortized Cost and Gross Unrealized Holding Gains and Losses of Securities (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018
Available For Sale Securities [Line Items]
Available-for sale securities - fair value	$ 102	$ 266
Amortized cost	103
Gross unrealized holding gains	19
Gross unrealized holding losses	20
Other Current Assets [Member]
Available For Sale Securities [Line Items]
Available-for sale securities - fair value	14	2
Other Non-current Assets [Member]
Available For Sale Securities [Line Items]
Available-for sale securities - fair value	83	61
Money Markets [Member]
Available For Sale Securities [Line Items]
Available-for sale securities - fair value	$ 5	$ 203

X

- Definition

Available For Sale Securities [Line Items]

+ References

No definition available.

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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- Definition

Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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